Variable Resistor with Variable Capacitor
Purpose
Controlled resistance in parallel with controlled capacitance
Library
Electrical / Passive Components
Description
This component models a variable resistor with a variable capacitor connected in parallel. The resistance and capacitance are determined by the signals fed into the inputs of the component. The current through this component is determined by the equation
The control signal for the capacitor must provide the values of both and
in
the following form:
. It is the responsibility of the
user to provide the appropriate signals for a particular purpose. For detailed
information see the Variable Capacitor.
If the component has multiple phases you can choose to include the capacitive
coupling of the phases. In this case the control signal vector must contain the
elements of the capacitance matrix (row by row) and their derivatives with respect to
time. The control signal thus has a width of ,
being the number of
phases.
Note The momentary capacitance and the resistance may not be set to zero. In case of coupled capacitors, the capacitance matrix may not be singular.
Parameters
- Capacitive coupling
- Specifies whether the phases should be coupled capacitively. This parameter determines how the elements of the control signal are interpreted. The default is off.
- Initial voltage
- The initial voltage of the capacitor at simulation start, in volts (V). This parameter may either be a scalar or a vector corresponding to the implicit width of the component. The positive pole is marked with a "+". The initial voltage default is 0.
Probe Signals
- Capacitor voltage
- The voltage measured across the capacitor, in volts (V). A positive voltage is measured when the potential at the terminal marked with "+" is greater than the potential at the unmarked terminal.